I found an issue with a settings subsystem implementation on an nrf5340DK board I'm working with. I originally implemented the settings subsystem on an nrf52840DK which worked fine there. Later I needed to port that functionality over to the nrf5340DK where things fell apart. I debugged the issue down to a flash read command called from nvs_flash_rd() (ncs\v2.3.0\zephyr\subsys\fs\nvs\nvs.c). The failure is an access violation which triggers a reboot. I ran the settings subsystem sample on the nrf5340Dk and that worked fine. So I started working to pin down config settings that may be exposing this issue. I found that CONFIG_BOOTLOADER_MCUBOOT=y along with CONFIG_FILE_SYSTEM=y and CONFIG_FILE_SYSTEM_LITTLEFS=y will cause the settings subsystem initialization to fail. Setting CONFIG_BOOTLOADER_MCUBOOT or the file system settings by themselves will work but, setting them together causes an access violation. Will you please take a look at the v2.3.0 settings subsystem sample along with my modified prj.config file and see if you can figure out what the problem is?
